Helen Schonenberg Ronny Mans Nick Russell Nataliya Mulyar Wil M. P. van der Aalst Towards a Taxonomy of Process Flexibility. 81-84 2008 CAiSE Forum http://ceur-ws.org/Vol-344/paper21.pdf conf/caise/2008fo db/conf/caise/caisefo2008.html#SchonenbergMRMA08